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Title: Better Absorbents for Ammonia Separation

Making ammonia from renewable wind energy at a competitive price may be possible if the conventional ammonia condenser is replaced with an ammonia absorber. Such a process change requires an ammonia selective absorbent. Supported metal halide sorbents for this separation display outstanding dynamic capacity close to their equilibrium thermodynamic limits. Alkaline earth chlorides and bromides supported on silica and zeolite Y are the most promising. MgCl 2 and CaBr 2 at 40% loading on silica show capacities of 60-70 mg NH3/gsorbent at 150 °C and 4 bar. Overall, cations with smaller atomic numbers show more affinity to ammonia; bromides hold ammonia more strongly than chlorides. Different solvents and metal halide mixtures do not show significant changes in the absorption capacity. Finally, these absorbents can be incorporated into ammonia reaction-absorption syntheses to achieve faster production rates.
Authors:
ORCiD logo [1] ;  [1] ;  [1] ;  [1] ; ORCiD logo [1] ; ORCiD logo [1]
  1. Univ. of Minnesota, Minneapolis, MN (United States). Chemical Engineering and Materials Science
Publication Date:
Grant/Contract Number:
AR0000804
Type:
Accepted Manuscript
Journal Name:
ACS Sustainable Chemistry & Engineering
Additional Journal Information:
Journal Name: ACS Sustainable Chemistry & Engineering; Journal ID: ISSN 2168-0485
Publisher:
American Chemical Society (ACS)
Research Org:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Org:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 17 WIND ENERGY; Ammonia; Absorption; Metal halides; Wind energy
OSTI Identifier:
1434930

Malmali, Mahdi, Le, Giang, Hendrickson, Jennifer, Prince, Joshua, McCormick, Alon V., and Cussler, E. L.. Better Absorbents for Ammonia Separation. United States: N. p., Web. doi:10.1021/acssuschemeng.7b04684.
Malmali, Mahdi, Le, Giang, Hendrickson, Jennifer, Prince, Joshua, McCormick, Alon V., & Cussler, E. L.. Better Absorbents for Ammonia Separation. United States. doi:10.1021/acssuschemeng.7b04684.
Malmali, Mahdi, Le, Giang, Hendrickson, Jennifer, Prince, Joshua, McCormick, Alon V., and Cussler, E. L.. 2018. "Better Absorbents for Ammonia Separation". United States. doi:10.1021/acssuschemeng.7b04684.
@article{osti_1434930,
title = {Better Absorbents for Ammonia Separation},
author = {Malmali, Mahdi and Le, Giang and Hendrickson, Jennifer and Prince, Joshua and McCormick, Alon V. and Cussler, E. L.},
abstractNote = {Making ammonia from renewable wind energy at a competitive price may be possible if the conventional ammonia condenser is replaced with an ammonia absorber. Such a process change requires an ammonia selective absorbent. Supported metal halide sorbents for this separation display outstanding dynamic capacity close to their equilibrium thermodynamic limits. Alkaline earth chlorides and bromides supported on silica and zeolite Y are the most promising. MgCl2 and CaBr2 at 40% loading on silica show capacities of 60-70 mgNH3/gsorbent at 150 °C and 4 bar. Overall, cations with smaller atomic numbers show more affinity to ammonia; bromides hold ammonia more strongly than chlorides. Different solvents and metal halide mixtures do not show significant changes in the absorption capacity. Finally, these absorbents can be incorporated into ammonia reaction-absorption syntheses to achieve faster production rates.},
doi = {10.1021/acssuschemeng.7b04684},
journal = {ACS Sustainable Chemistry & Engineering},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {3}
}